Nodejs连接PostgreSQL

var pg = require('pg');
//数据库配置
var conString = "tcp://postgres:root@localhost/nodejspg"; //tcp://用户名：密码@localhost/数据库名
var client =  new pg.Client(conString);

var tem = 33;
//sql语句
selectSQLString = 'insert into pet(tem) values ('+tem+') ';
//客户端连接，进行数据插入
client.connect(function(error, results){
  if (error) {
    console.log('clientConnectionReady Error:'+error.message);
    client.end();
    return;
  }
  console.log('connection success...\n');
  client.query(selectSQLString,function(error,results){
    console.log(error);
  })
});

 alter table pet add column time timestamp without time zone not null default localtimestamp(0);